A bath constructor, Taisuke was researching natural springs of water, such as the one on the Deserted Islands. As he was soaking in the water, however, he realized that he had left his clothes outside. Lazlo, who happened to be coming by, retrieved his clothes, and Taisuke joined them in gratitude, building baths on the ship. After the war, Taisuke traveled, building bath houses in many places. - Matt620

Gameplay Information for Suikoden IV

How to Recruit: After your headquarters is launched into the sea, return to the Deserted Island cavern and speak with Taisuke. After speaking with him, attempt to leave; he will eventually request that you bring over his clothes. After doing this, leave the cavern and then return to speak with Taisuke once more.